Improvement in glass-furnaces



J. M. BROOKPIELD. Glass-Furnace.

No. 200,973. Patented March 5,1878.

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W %%bz;fi/l/ A-MM UNITED STATES PATENT OFFICE.

JAMES M. BROOKFIELD, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN GLASS-FURNACES.

Specification forming part of Letters Patent No. 200,973, dated March 5,1878; application filed February 13, 1878.

To all whom it may concern Be it known that I, JAMES M.BROOKFIELD, ofBrooklyn,in the county of Kings and State of New York, have invented anew and useful Improvement in Glass Furnaces, which improvement is fullyset forth in the following,

specification, reference being had to the accompanying drawing, inwhich- Figure 1 represents a longitudinal vertical section of a furnaceembracing my invention. Fig. 2 is a horizontal section thereof in theline as m, Fig. 1.

Similar letters indicate corresponding parts.

My invention is especially adapted to that class of furnaces having atank to receive the substance to be fused or molten.

In this class of furnaces it is common to form an airrpassage in thesill or partition between the fire-place and the tank, for the purposeof cooling the partition, and to introduce an air-blast through theashpit, also sometimes called the Wind-box,for the purpose ofaccelerating combustion, the air-passage bein g supplied with air orother cooling medium independently of the ash-pit.

The object of my invention is to permit of using a single blast of airin cooling the sill or partition and driving the fire.

To this end it consists in combining, with the aforesaid sill orpartition and the ash-pit, a wind-box or chamber, which is formedbeneath the sill or partition, and communicates with the ash-pit, sothat if air is introduced to this wind-box or chamber it circulatesthrough the same, and thence passes into the ash-pit.

In the drawing, the letter A designates the tank of my furnace,constructed with a plain bottom; and B is the roof of the tank, having asolid form. a a are working-holes, through which the raw material isintroduced, gathered, &c., and whichallow the products of combustion toescape. G is thefire-place, communicating with the tank by means of apassage, b. D is the grate, and E is the ash-pit or space beneath thegrate. c is the sill or partition between the the place 0 and the tank,and which, in the example shown, is curved. Beneath this sill orpartition 0 in the brick-work or other material of which my furnace isbuilt, I form a closed box or chamber, F, which, in the example shown,is arranged to be connected with a fan-blower or other air-forcingdevice by means of a pipe, 01, and communicates with the ash-pit Ethrough holes e formed in the wall, by which said box or 'chamber andthe ash-pit are divided from each other.

The air supplied to the box or chamber F circulates through the chamber,so as to effectually cool the sill or partition 0, and then passes intothe ash-pit E through the holes 6. The durability of the furnace is thusincreased, with a great reduction in the expense and trouble attendingthe attainment of the like object in the old class of tank-furnaces.

Instead of connecting the chamber F with a fan-blower, atmospheric airmay be allowed to enter thesame by its own pressure; and it is obviousthat I can also use steam instead of air.

I claim as new and desire to secure by Letters Patent- In aglass-furnace, the combination of the wind-box F, arranged in the rearof the ashpit, and communicating therewith through the passage 6, andthe pipe d, projecting outward from said wind-box, substantially as andfor the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 8th day of February, 1878.

JAMES M. BROOKFIELD.

Witnesses:

CHAS. WAHLERS, D. W. BRooKFmLD.

